1.1 Why a tiered schedule works

Not every check needs a shutdown, and not every problem waits a month to show up. Splitting inspection into daily, weekly, and monthly tiers matches the effort to how fast each type of problem develops — quick visual checks catch sudden issues immediately, while deeper measurements catch slow wear before it becomes critical.

Rule of thumb: the faster a fault can develop, the more often it needs eyes on it. Discharge shape can change in minutes; liner thickness changes over weeks.

1.2 The three tiers

Daily

OPERATOR · VISUAL

Underflow discharge shape (spray vs. rope)
Air core visible at overflow
Feed pressure and density readings
Unusual noise or vibration
Visible leaks at joints or seals

Weekly

TECHNICIAN · SPOT-CHECK

Visual liner wear at accessible points
Apex opening size and shape
Gasket and seal condition
Feed pump condition and pressure trend
Cluster manifold for uneven feed split

Monthly

RELIABILITY · MEASURED

Full liner thickness measurement
Internal inspection during shutdown
Flange torque and alignment check
Wear-trend comparison against baseline
Update inspection log and life estimate

1.3 Who does what

Responsibility should follow the tier — operators are best placed for daily checks since they're already at the panel, while deeper monthly measurements need a technician with the right gauges and, usually, a planned shutdown.

Tier	Typical owner	Shutdown required
Daily	Plant operator	No
Weekly	Maintenance technician	Usually not
Monthly	Reliability / maintenance team	Yes, for internal checks

Key Takeaways

Match inspection frequency to how fast each fault type can develop — daily for visible operating signs, monthly for slow wear.
Daily checks need no shutdown and belong to the operator already at the panel.
Monthly measurements build the wear-trend history that later lessons rely on for predicting remaining liner life.
A missed daily check is a missed early warning — consistency matters more than depth for this tier.